// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <pollux/expression/function_signature.h>
#include <pollux/vector/utils.h>

namespace kumo::pollux::fuzzer {

/// Generates random, but valid input types for a specified function signature
/// with the return type.
class ArgTypesGenerator {
 public:
  virtual ~ArgTypesGenerator() = default;

  /// Given a signature and a concrete return type returns randomly selected
  /// valid input types. Returns empty vector if no input types can produce the
  /// specified result type.
  virtual std::vector<TypePtr> generateArgs(
      const exec::FunctionSignature& signature,
      const TypePtr& returnType,
      FuzzerGenerator& rng) = 0;
};

} // namespace kumo::pollux::fuzzer
